I used to bite mine - and when I was about 10 or 11 years old, my Dad took me to a old time druggist he knew well, and I was made to WATCH as he mixed up a concoction of meds, some that said POISON on them, and was told Dad would paint my nails with this stuff each morning. Well - little did I know that they switched bottles on me(what Dad painted on the next morning contained NO poison , but of course I never tasted it to find out) - but it sure as heck cured me!!!! LOL Now I have to use toe nail clippers on my fingernails they are so hard and long ! Seriously, have u tried any of that nasty tasting stuff you can buy in the drug store for nai bitters? At least that would make you aware you are doing it (even if u can tolerate the taste"), and perhaps you would then think "hey - I just bit my nails and I dont want to do that anymore", and it would help. Good luck ! I know many people have trouble stopping this habit.